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List: freedesktop-dbus
Subject: Re: OpenTelemetry tracing of Dbus calls
From: "Thomas Kluyver" <thomas () kluyver ! me ! uk>
Date: 2023-01-10 11:34:24
Message-ID: f9d072bd-f9bf-4d34-aaff-71579f827f9a () app ! fastmail ! com
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On Mon, 9 Jan 2023, at 10:28, Umut Tezduyar Lindskog wrote:
> Can the tracing/context data be sent over the dbus message header, granted this \
> needs to be supported by the dbus client libraries?
D-Bus has a 'header fields' array, but it doesn't allow non-standard headers, so to \
add a new field you'd need to propose a change to the spec. There are only 9 fields \
defined so far, in contrast to the dozens of standardised header fields for HTTP, and \
those 9 are all kind of integral to using D-Bus - there's no general metadata like \
the HTTP Date or Server headers. So I might guess this would be a tough sell, though \
it's not up to me.
Have you come across specific scenarios where something you're tracing is using D-Bus \
messages and you want to follow them? Perhaps starting from a concrete example would \
make prompt more discussion than the abstract approach.
Best wishes,
Thomas
[Attachment #3 (text/html)]
<!DOCTYPE html><html><head><title></title><style \
type="text/css">p.MsoNormal,p.MsoNoSpacing{margin:0}</style></head><body><div>On Mon, \
9 Jan 2023, at 10:28, Umut Tezduyar Lindskog wrote:<br></div><blockquote type="cite" \
id="qt" style=""><div dir="ltr"><div>Can the tracing/context data be sent over the \
dbus message header, granted this needs to be supported by the dbus client \
libraries? <br></div></div></blockquote><div><br></div><div>D-Bus has a 'header \
fields' array, but it doesn't allow non-standard headers, so to add a new field you'd \
need to propose a change to the spec. There are only 9 fields defined so far, in \
contrast to the dozens of standardised header fields for HTTP, and those 9 are all \
kind of integral to using D-Bus - there's no general metadata like the HTTP Date or \
Server headers. So I might guess this would be a tough sell, though it's not up to \
me.<br></div><div><br></div><div>Have you come across specific scenarios where \
something you're tracing is using D-Bus messages and you want to follow them? Perhaps \
starting from a concrete example would make prompt more discussion than the abstract \
approach.<br></div><div><br></div><div>Best \
wishes,<br></div><div>Thomas<br></div></body></html>
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